This section of the FEDERAL REGISTER

contains notices to the public of the proposed

issuance of rules and regulations. The

purpose of these notices is to give interested

persons an opportunity to participate in the

rule making prior to the adoption of the final

rules.

Proposed Rules Federal Register

88541 

Vol. 88, No. 245 

Friday, December 22, 2023 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–2397; Project 

Identifier MCAI–2023–00601–T] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc., Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

certain Bombardier, Inc., Model BD– 

700–1A10 and BD–700–1A11 airplanes. 

This proposed AD was prompted by the 

discovery that existing maintenance 

tasks do not detect the potential failure 

of the passenger door detent mechanism 

because there is no procedure for 

inspecting the passenger door locking 

mechanism. This proposed AD would 

require revising the maintenance or 

inspection program, as applicable, to 

require use of a certain aircraft 

maintenance manual (AMM) task during 

accomplishment of a specified 

maintenance check. The FAA is 

proposing this AD to address the unsafe 

condition on these products. 

DATES: The FAA must receive comments 

on this proposed AD by February 5, 

2024. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

regulations.gov. Follow the instructions 

for submitting comments. 

• Fax: 202–493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

Material for Incorporation by 

Reference: For service information 

identified in this AD, contact 

Bombardier Business Aircraft Customer 

Response Center, 400 Coˆte-Vertu Road 

West, Dorval, Que ́bec H4S 1Y9, Canada; 

telephone 514–855–2999; email ac.yul@

aero.bombardier.com; website 

bombardier.com. 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–2397; or in person at 

Docket Operations between 9 a.m. and 

5 p.m., Monday through Friday, except 

Federal holidays. The AD docket 

contains this NPRM, the mandatory 

continuing airworthiness information 

(MCAI), any comments received, and 

other information. The street address for 

Docket Operations is listed above. 

FOR FURTHER INFORMATION CONTACT: 

Gabriel Kim, Aviation Safety Engineer, 

FAA, 1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; telephone 516– 

228–7300; email 9-avs-nyaco-cos@

faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

The FAA invites you to send any 

written relevant data, views, or 

arguments about this proposal. Send 

your comments to an address listed 

under ADDRESSES. Include ‘‘Docket No. 

FAA–2023–2397; Project Identifier 

MCAI–2023–00601–T’’ at the beginning 

of your comments. The most helpful 

comments reference a specific portion of 

the proposal, explain the reason for any 

recommended change, and include 

supporting data. The FAA will consider 

all comments received by the closing 

date and may amend the proposal 

because of those comments. 

Except for Confidential Business 

Information (CBI) as described in the 

following paragraph, and other 

information as described in 14 CFR 

11.35, the FAA will post all comments 

received, without change, to 

regulations.gov, including any personal 

information you provide. The agency 

will also post a report summarizing each 

substantive verbal contact received 

about this NPRM. 

Confidential Business Information 

CBI is commercial or financial 

information that is both customarily and 

actually treated as private by its owner. 

Under the Freedom of Information Act 

(FOIA) (5 U.S.C. 552), CBI is exempt 

from public disclosure. If your 

comments responsive to this NPRM 

contain commercial or financial 

information that is customarily treated 

as private, that you actually treat as 

private, and that is relevant or 

responsive to this NPRM, it is important 

that you clearly designate the submitted 

comments as CBI. Please mark each 

page of your submission containing CBI 

as ‘‘PROPIN.’’ The FAA will treat such 

marked submissions as confidential 

under the FOIA, and they will not be 

placed in the public docket of this 

NPRM. Submissions containing CBI 

should be sent to Gabriel Kim, Aviation 

Safety Engineer, FAA, 1600 Stewart 

Avenue, Suite 410, Westbury, NY 

11590; telephone 516–228–7300; email 

9-avs-nyaco-cos@faa.gov. Any 

commentary that the FAA receives 

which is not specifically designated as 

CBI will be placed in the public docket 

for this rulemaking. 

Background 

Transport Canada, which is the 

aviation authority for Canada, has 

issued Transport Canada AD CF–2023– 

25, dated April 13, 2023 (Transport 

Canada AD CF–2023–25) (also referred 

to after this as the MCAI), to correct an 

unsafe condition on certain Bombardier, 

Inc., Model BD–700–1A10 and BD–700– 

1A11 airplanes. The MCAI states time 

limited maintenance check (TLMC) item 

52–11–00–201, ‘‘Passenger Door 

Mechanism Functional Test,’’ does not 

detect potential failure of the passenger 

door detent mechanism. Associated 

aircraft maintenance manual (AMM) 

task 52–11–00–720–801, ‘‘Passenger 

Door Mechanism Functional Test,’’ does 

not provide a procedure for inspecting 

the passenger door locking mechanism. 

The FAA is proposing this AD to 

address potential failures of the 

uninspected detents (external handle 

detent and torque tube detent) in 

combination with a failure of the 

tension pot spring assembly. The unsafe 

condition, if not addressed, could result 

in the main passenger door opening 

during unpressurized flight. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2023–2397. 


ddrumheller on DSK120RN23PROD with PROPOSALS1
88542 Federal Register / Vol. 88, No. 245 / Friday, December 22, 2023 / Proposed Rules 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed the following 

documents. 

• Task 52–11–00–720–801, 

Bombardier Global Express Aircraft 

Maintenance Manual, Part Two— 

Publication No. BD–700 AMM, Revision 

97, dated March 30, 2023. (For obtaining 

the task for Bombardier Global Express 

AMM, Part Two—Publication No. BD– 

700 AMM, use Document Identification 

No. GL 700 AMM.) 

• Task 52–11–00–720–801, 

Bombardier Global 5000 Aircraft 

Maintenance Manual, Part Two— 

Publication No. BD–700 AMM, Revision 

78, dated March 30, 2023. (For obtaining 

the task for Bombardier Global 5000 

AMM, Part Two—Publication No. BD– 

700 AMM, use Document Identification 

No. GL 5000 AMM.) 

• Task 52–11–00–720–801, 

Bombardier Global 5000 Aircraft 

Maintenance Manual—Part Two— 

Publication No. GL 5000 GVFD AMM, 

Revision 45, dated March 30, 2023. 

• Task 52–11–00–720–801, 

Bombardier Global 5500 Aircraft 

Maintenance Manual—Part Two— 

Publication No. GL 5500 AMM, 

Revision 14, dated March 30, 2023. 

• Task 52–11–00–720–801, 

Bombardier Global 6000 Aircraft 

Maintenance Manual—Part Two— 

Publication No. GL 6000 AMM, 

Revision 46, dated March 30, 2023. 

• Task 52–11–00–720–801, 

Bombardier Global 6500 Aircraft 

Maintenance Manual—Part Two— 

Publication No. GL 6500 AMM, 

Revision 15, dated March 30, 2023. 

• Task 52–11–00–720–801, 

Bombardier Global Express XRS Aircraft 

Maintenance Manual—Part Two— 

Publication No. BD–700 XRS AMM, 

Revision 75, dated March 30, 2023. (For 

obtaining the task for Bombardier Global 

Express XRS AMM, Part Two— 

Publication No. BD–700 XRS AMM, use 

Document Identification No. GL XRS 

AMM.) 

This service information specifies 

new inspection instructions for the 

passenger door detent mechanisms. 

This service information is reasonably 

available because the interested parties 

have access to it through their normal 

course of business or by the means 

identified in ADDRESSES. 

FAA’s Determination 

This product has been approved by 

the aviation authority of another 

country, and is approved for operation 

in the United States. Pursuant to the 

FAA’s bilateral agreement with this 

State of Design Authority, it has notified 

the FAA of the unsafe condition 

described in the MCAI and service 

information referenced above. The FAA 

is issuing this NPRM after determining 

that the unsafe condition described 

previously is likely to exist or develop 

on other products of the same type 

design. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require the 

use of AMM Task 52–11–00–720–801, 

dated August 16, 2022, during 

accomplishment of TLMC Item 52–11– 

00–201. It also prohibits using AMM 

Task 52–11–00–720–801, dated 19 May 

2022 or earlier. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 482 

airplanes of U.S. registry. The FAA 

estimates the following costs to comply 

with this proposed AD: 

The FAA has determined that revising 

the maintenance or inspection program 

takes an average of 90 work-hours per 

operator, although the agency 

recognizes that this number may vary 

from operator to operator. Since 

operators incorporate maintenance or 

inspection program changes for their 

affected fleet(s), the FAA has 

determined that a per-operator estimate 

is more accurate than a per-airplane 

estimate. Therefore, the agency 

estimates the average total cost per 

operator to be $7,650 (90 work-hours × 

$85 per work-hour). 

Authority for This Rulemaking 

Title 49 of the United States Code 

specifies the FAA’s authority to issue 

rules on aviation safety. Subtitle I, 

section 106, describes the authority of 

the FAA Administrator. Subtitle VII: 

Aviation Programs, describes in more 

detail the scope of the Agency’s 

authority. 

The FAA is issuing this rulemaking 

under the authority described in 

Subtitle VII, Part A, Subpart III, Section 

44701: General requirements. Under 

that section, Congress charges the FAA 

with promoting safe flight of civil 

aircraft in air commerce by prescribing 

regulations for practices, methods, and 

procedures the Administrator finds 

necessary for safety in air commerce. 

This regulation is within the scope of 

that authority because it addresses an 

unsafe condition that is likely to exist or 

develop on products identified in this 

rulemaking action. 

Regulatory Findings 

The FAA determined that this 

proposed AD would not have federalism 

implications under Executive Order 

13132. This proposed AD would not 

have a substantial direct effect on the 

States, on the relationship between the 

national Government and the States, or 

on the distribution of power and 

responsibilities among the various 

levels of government. 

For the reasons discussed above, I 

certify this proposed regulation: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Would not affect intrastate 

aviation in Alaska, and 

(3) Would not have a significant 

economic impact, positive or negative, 

on a substantial number of small entities 

under the criteria of the Regulatory 

Flexibility Act. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA proposes to amend 14 CFR part 

39 as follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

Bombardier, Inc.: Docket No. FAA–2023– 

2397; Project Identifier MCAI–2023– 

00601–T. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by February 5, 

2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Bombardier, Inc., 

Model BD–700–1A10 and BD–700–1A11 

airplanes, certificated in any category, serial 

numbers (S/Ns) 9002 through 60065 

inclusive. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 52, Doors. 

(e) Unsafe Condition 

This AD was prompted by the discovery 

that existing maintenance tasks do not detect 

the potential failure of the passenger door 

detent mechanism because there is no 

procedure for inspecting the passenger door 

locking mechanism. The FAA is proposing 


ddrumheller on DSK120RN23PROD with PROPOSALS1
Federal Register / Vol. 88, No. 245 / Friday, December 22, 2023 / Proposed Rules 88543 

this AD to address potential failures of the 

uninspected detents (external handle detent 

and torque tube detent) in combination with 

a failure of the tension pot spring assembly. 

The unsafe condition, if not addressed, could 

result in the main passenger door opening 

during unpressurized flight. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Maintenance or Inspection Program Task 

Restrictions 

Within 30 days after the effective date of 

this AD, revise the existing maintenance or 

inspection program, as applicable, to use 

Aircraft Maintenance Manual (AMM) Task 

52–11–00–720–801, ‘‘Functional Test of the 

Passenger Door Mechanism,’’ as specified in 

the applicable AMMs identified in figure 1 to 

paragraph (g) of this AD, when performing 

time limited maintenance check item 52–11– 

00–201. 

FIGURE 1 TO PARAGRAPH (g)—BOMBARDIER AMM 

Airplane model Bombardier AMM 

BD–700–1A10 ..................................................... Bombardier Global Express Aircraft Maintenance Manual—Part Two, Publication No. BD–700 

AMM, Revision 97, dated March 30, 2023. 

BD–700–1A11 ..................................................... Bombardier Global 5000 Aircraft Maintenance Manual—Part Two, Publication No. BD–700 

AMM, Revision 78, dated March 30, 2023. 

BD–700–1A11 ..................................................... Bombardier Global 5000 Aircraft Maintenance Manual—Part Two, Publication No. GL 5000 

GVFD AMM, Revision 45, dated March 30, 2023. 

BD–700–1A11 ..................................................... Bombardier Global 5500 Aircraft Maintenance Manual—Part Two, Publication No. GL 5500 

AMM, Revision 14, dated March 30, 2023. 

BD–700–1A10 ..................................................... Bombardier Global 6000 Aircraft Maintenance Manual—Part Two, Publication No. GL 6000 

AMM, Revision 46, dated March 30, 2023. 

BD–700–1A10 ..................................................... Bombardier Global 6500 Aircraft Maintenance Manual—Part Two, Publication No. GL 6500 

AMM, Revision 15, dated March 30, 2023. 

BD–700–1A10 ..................................................... Bombardier Global Express XRS Aircraft Maintenance Manual—Part Two, Publication No. 

BD–700 XRS AMM, Revision 75, dated March 30, 2023. 

(h) AMM Revision Prohibition 

After revising the maintenance or 

inspection program as required by paragraph 

(g) of this AD, it is prohibited to use AMM 

Task 52–11–00–720–801, dated May 19, 

2022, or earlier. 

(i) Additional AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, International 

Validation Branch, FAA, has the authority to 

approve AMOCs for this AD, if requested 

using the procedures found in 14 CFR 39.19. 

In accordance with 14 CFR 39.19, send your 

request to your principal inspector or 

responsible Flight Standards Office, as 

appropriate. If sending information directly 

to the manager of the International Validation 

Branch, mail it to the address identified in 

paragraph (j)(2) of this AD. Information may 

be emailed to: 9-AVS-NYACO-COS@faa.gov. 

Before using any approved AMOC, notify 

your appropriate principal inspector, or 

lacking a principal inspector, the manager of 

the responsible Flight Standards Office. 

(2) Contacting the Manufacturer: For any 

requirement in this AD to obtain instructions 

from a manufacturer, the instructions must 

be accomplished using a method approved 

by the Manager, International Validation 

Branch, FAA; or Transport Canada or 

Bombardier, Inc.’s Transport Canada Design 

Approval Organization (DAO). If approved by 

the DAO, the approval must include the 

DAO-authorized signature. 

(j) Additional Information 

(1) Refer to Transport Canada AD CF– 

2023–25, dated April 13, 2023, for related 

information. This Transport Canada AD may 

be found in the AD docket at regulations.gov 

under Docket No. FAA–2023–2397. 

(2) For more information about this AD, 

contact Gabriel Kim, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone 516– 

228–7300; email 9-avs-nyaco-cos@faa.gov. 

(k) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) of the service information listed in this 

paragraph under 5 U.S.C. 552(a) and 1 CFR 

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless this AD specifies otherwise. 

(i) Task 52–11–00–720–801, ‘‘Functional 

Test of the Passenger Door Mechanism,’’ of 

Part 2, Bombardier Global 5000 Aircraft 

Maintenance Manual, Part Two—Publication 

No. BD–700 AMM, Revision 78, dated March 

30, 2023. (For obtaining the task for 

Bombardier Global 5000 AMM, Part Two— 

Publication No. BD–700 AMM, use 

Document Identification No. GL 5000 AMM.) 

(ii) Task 52–11–00–720–801, ‘‘Functional 

Test of the Passenger Door Mechanism,’’ of 

Part 2, Bombardier Global 5000 Aircraft 

Maintenance Manual—Part Two— 

Publication No. GL 5000 GVFD AMM, 

Revision 45, dated March 30, 2023. 

(iii) Task 52–11–00–720–801, ‘‘Functional 

Test of the Passenger Door Mechanism,’’ of 

Part 2, Bombardier Global 5500 Aircraft 

Maintenance Manual—Part Two— 

Publication No. GL 5500 AMM, Revision 14, 

dated March 30, 2023. 

(iv) Task 52–11–00–720–801, ‘‘Functional 

Test of the Passenger Door Mechanism,’’ of 

Part 2, Bombardier Global 6000 Aircraft 

Maintenance Manual—Part Two— 

Publication No. GL 6000 AMM, Revision 46, 

dated March 30, 2023. 

(v) Task 52–11–00–720–801, ‘‘Functional 

Test of the Passenger Door Mechanism,’’ of 

Part 2, Bombardier Global 6500 Aircraft 

Maintenance Manual—Part Two— 

Publication No. GL 6500 AMM, Revision 15, 

dated March 30, 2023. 

(vi) Task 52–11–00–720–801, ‘‘Functional 

Test of the Passenger Door Mechanism,’’ of 

Part 2, Bombardier Global Express Aircraft 

Maintenance Manual, Part Two—Publication 

No. BD–700 AMM, Revision 97, dated March 

30, 2023. (For obtaining the task for 

Bombardier Global Express AMM, Part 

Two—Publication No. BD–700 AMM, use 

Document Identification No. GL 700 AMM.) 

(vii) Task 52–11–00–720–801, ‘‘Functional 

Test of the Passenger Door Mechanism,’’ of 

Part 2, Bombardier Global Express XRS 

Aircraft Maintenance Manual—Part Two— 

Publication No. BD–700 XRS AMM, Revision 

75, dated March 30, 2023. (For obtaining the 

task for Bombardier Global Express XRS 

AMM, Part Two—Publication No. BD–700 

XRS AMM, use Document Identification No. 

GL XRS AMM.) 

(3) For service information identified in 

this AD, contact Bombardier Business 

Aircraft Customer Response Center, 400 CoˆteVertu Road West, Dorval, Que ́bec H4S 1Y9, 

Canada; telephone 514–855–2999; email 

ac.yul@aero.bombardier.com; website 

bombardier.com. 

(4) You may view this service information 

at the FAA, Airworthiness Products Section, 

Operational Safety Branch, 2200 South 216th 

St., Des Moines, WA. For information on the 

availability of this material at the FAA, call 

206–231–3195. 

(5) You may view this material at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

visit www.archives.gov/federal-register/cfr/ 

ibr-locations or email fr.inspection@nara.gov. 


ddrumheller on DSK120RN23PROD with PROPOSALS1
88544 Federal Register / Vol. 88, No. 245 / Friday, December 22, 2023 / Proposed Rules 

Issued on December 14, 2023. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–28003 Filed 12–21–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–2398; Project 

Identifier AD–2023–00423–T] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for all 

The Boeing Company Model 787–8, 

787–9, and 787–10 airplanes. This 

proposed AD was prompted by a report 

indicating that the oxygen supply tubing 

can become kinked when certain 

passenger service unit (PSU) oxygen 

panel assemblies are installed in the 

forward-most position of a center stow 

bin. This proposed AD would require a 

one-time inspection of the affected PSU 

oxygen panel assemblies and applicable 

on-condition actions. This proposed AD 

would also prohibit the installation of 

affected parts. The FAA is proposing 

this AD to address the unsafe condition 

on these products. 

DATES: The FAA must receive comments 

on this proposed AD by February 5, 

2024. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

regulations.gov. Follow the instructions 

for submitting comments. 

• Fax: 202–493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–2398; or in person at 

Docket Operations between 9 a.m. and 

5 p.m., Monday through Friday, except 

Federal holidays. The AD docket 

contains this NPRM, any comments 

received, and other information. The 

street address for Docket Operations is 

listed above. 

Material Incorporated by Reference: 

• For service information identified 

in this NPRM, contact Boeing 

Commercial Airplanes, Attention: 

Contractual & Data Services (C&DS), 

2600 Westminster Blvd., MC 110–SK57, 

Seal Beach, CA 90740–5600; telephone 

562–797–1717; website 

myboeingfleet.com. 

• You may view this service 

information at the FAA, Airworthiness 

Products Section, Operational Safety 

Branch, 2200 South 216th St., Des 

Moines, WA. For information on the 

availability of this material at the FAA, 

call 206–231–3195. It is also available at 

regulations.gov by searching for and 

locating Docket No. FAA–2023–2398. 

FOR FURTHER INFORMATION CONTACT: 

Samuel Nalbandian, Aviation Safety 

Engineer, FAA, 2200 South 216th St., 

Des Moines, WA 98198; phone 206– 

231–3993; email: 

Samuel.K.Nalbandian@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

The FAA invites you to send any 

written relevant data, views, or 

arguments about this proposal. Send 

your comments to an address listed 

under ADDRESSES. Include ‘‘Docket No. 

FAA–2023–2398; Project Identifier AD– 

2023–00423–T’’ at the beginning of your 

comments. The most helpful comments 

reference a specific portion of the 

proposal, explain the reason for any 

recommended change, and include 

supporting data. The FAA will consider 

all comments received by the closing 

date and may amend this proposal 

because of those comments. 

Except for Confidential Business 

Information (CBI) as described in the 

following paragraph, and other 

information as described in 14 CFR 

11.35, the FAA will post all comments 

received, without change, to 

regulations.gov, including any personal 

information you provide. The agency 

will also post a report summarizing each 

substantive verbal contact received 

about this NPRM. 

Confidential Business Information 

CBI is commercial or financial 

information that is both customarily and 

actually treated as private by its owner. 

Under the Freedom of Information Act 

(FOIA) (5 U.S.C. 552), CBI is exempt 

from public disclosure. If your 

comments responsive to this NPRM 

contain commercial or financial 

information that is customarily treated 

as private, that you actually treat as 

private, and that is relevant or 

responsive to this NPRM, it is important 

that you clearly designate the submitted 

comments as CBI. Please mark each 

page of your submission containing CBI 

as ‘‘PROPIN.’’ The FAA will treat such 

marked submissions as confidential 

under the FOIA, and they will not be 

placed in the public docket of this 

NPRM. Submissions containing CBI 

should be sent to Samuel Nalbandian, 

Aviation Safety Engineer, FAA, 2200 

South 216th St., Des Moines, WA 98198; 

phone: 206–231–3993; email: 

Samuel.K.Nalbandian@faa.gov. Any 

commentary that the FAA receives that 

is not specifically designated as CBI will 

be placed in the public docket for this 

rulemaking. 

Background 

The FAA has received a report 

indicating that a pinching condition 

may exist between the oxygen supply 

tube on the PSU oxygen panel and the 

stowage bin end blade on affected PSU 

oxygen panel assemblies and may result 

in the inability of the oxygen system to 

provide oxygen to the airplane’s 

passengers in a cabin depressurization 

event. The PSU reverse bottle oxygen 

panel assembly drawing restructure 

introduced a conflict between lowerand upper-level assembly drawings. 

After the drawing restructure, the 

upper-level assembly drawings had 

corrected routing design intent, but the 

lower-level assembly drawings had 

incorrect routing definition. Installation 

of a PSU reverse bottle oxygen panel 

assembly with incorrect routing can 

lead to a condition where the oxygen 

supply tubing becomes kinked in the 

forward-most position of a center 

stowage bin. Incorrect routing of the 

tubing, if not addressed, could result in 

kinked tubing and consequent 

passengers’ injury because of a lack of 

supplemental oxygen during a cabin 

depressurization event. 

FAA’s Determination 

The FAA is issuing this NPRM after 

determining that the unsafe condition 

described previously is likely to exist or 

develop on other products of the same 

type design. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Boeing Alert 

Requirements Bulletins B787–81205– 

SB250277–00 RB and B787–81205– 

SB250278–00 RB, both Issue 001, both 

dated February 15, 2023. This service 

information specifies procedures for 

verifying the identification label of the 


ddrumheller on DSK120RN23PROD with PROPOSALS1